CA1248372A - Fastener device - Google Patents
Fastener deviceInfo
- Publication number
- CA1248372A CA1248372A CA000407729A CA407729A CA1248372A CA 1248372 A CA1248372 A CA 1248372A CA 000407729 A CA000407729 A CA 000407729A CA 407729 A CA407729 A CA 407729A CA 1248372 A CA1248372 A CA 1248372A
- Authority
- CA
- Canada
- Prior art keywords
- fastener
- abutment
- elongate element
- pin
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Insertion Pins And Rivets (AREA)
Abstract
ABSTRACT
An elongate pin extends in an axial bore in a threaded fastener, at least one end portion of the pin protruding from the bore. An abutment is provided on said one end portion, which when the fastener is in an unstressed condition may rotate about the longitudinal axis thereof relative to the fastener. When the fastener is tightened, a clearance between the abutment and an end face of the fastener is eliminated so that, when the tension in the fastener reaches a predetermined value, the abutment is no longer free to rotate.
An elongate pin extends in an axial bore in a threaded fastener, at least one end portion of the pin protruding from the bore. An abutment is provided on said one end portion, which when the fastener is in an unstressed condition may rotate about the longitudinal axis thereof relative to the fastener. When the fastener is tightened, a clearance between the abutment and an end face of the fastener is eliminated so that, when the tension in the fastener reaches a predetermined value, the abutment is no longer free to rotate.
Description
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This invention relates to a device comprising a fastener formed with a male screw thread and which, in use, is subjected to tension. The invention may be applied to bolts and studs.
The invention concerns the provision in a fastener device of means for enabling a user to determine when the device has been tightened to a predetermined degree. An example of a fastener device having such means is disclosed in U.S. Patent 2,413,797. This known fastener device is a bolt having a bore which extends along the axis of the bolt and is open at each end of the bolt. In an end face of the bolt remote from the head, there is provided a transverse groove. A rod extends along the entire length of the bore and is secured to the bolt adjacent to the head thereof. At the opposite end of the rod, there is provided an elongated head which, when the bolt is unstressed, protrudes from the end of the bolt.
When the bolt is subjected to a predetermined stress, the bolt is stretched and the head of the rod seats in the transverse groove so that it no longer protrudes from the end of the bolt. This indicates visually to the user that the bolt has been tightened a predetermined amount.
The degree of accuracy with which a predetermined stress can be established in the bolt disclosed in the aforesaid U.S. Patent depends upon the quality of the eyesight of the user, qualities of the fastener device~
for example the colour and cleanliness of the head of the rod and o~ the end of the bolt, an adequate level of illumination of the fastener device and upon whether the fastener device can be viewed from an appropriate position so that the line of sight is substantially perpendicular to the length oE the bolt.
According to a fi~rst aspeot of the invention, there is provided a device comprising a fastener formed with a male screw thread and with an opening extending through :
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the fastener in a direction parallel to an axi~s of the thread, the device further comprising an elongate element which extends through the opening, characterised in that the elongate element protrudes from opposite ends of the opening, in that there are on the elongate element respective abutments between which the fastener is trapped and in that, when the fastener is unstressed, at least one of the abutments is free to turn about the axis and, when the fastener is subjected to a predetermined tensile stress, the fastener is stretched to engage both abutments under pressure and thereby impede turning of said one of the abutments, relative to the fastener.
When a device in accordance with the invention is in use, the tension in the fastener can be checked by ascertaining whether the abutment is free to turn. If the abutment is free to turn, the tension is below the predetermined value. Clear vision of the fastener is not necessary, in order for the tension to be checked. It is merely necessary that the one abutment can be reached.
At least one, and preferably both, of the abutments is structurally separate from the elongate element and i5 engaged therewith in a manner to prevent mGvement of the abutment relative to the elongate element along the axis.
According to a second aspect of the invention there is provided a device comprising a hollow fastener formed with a male screw thread, a pin which is arranged co-axially with the thread and is disposed partly inside the fastener and partly protruding therefromJ a part of the pin which lies outside the fastener having an abutment which lies~adjacent to an end face of a fastener, and a part of the pin remote from the abutment being anchored against movement relative to the fastener along the axis towards said end face, characterised in that, when the fastener is unstressed, the abutment is free to turn about the axis relatiYe to the fastener andJ when the fastener is subjected to a predetermined tensile stress, the fastener ls stretched to establish a pressure contaot .
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-4between the abutment and said end face and thereby impede turning of the abutment relative to the fastener.
According to khis invention there is also provided a device comprising a fastener formed with a screw thread and having a bore extending therein parallel to the longitudinal axis of the thread, and an elongate element in the bore, the improvement wherein one end portion of the element protrudes from the bore and means is provided, which is operative between the fastener and the opposite end portion of the element, to prevent movement of said opposite end portion of the element relative to the fastener in at least one axial direction, and wherein when the fastener is in an unstressed condition a member on said one end portion of the elongate element is free to rotate about the longitudinal axis, and wherein when the fastener is subjected to a predetermined tensile stress, the member is brought into contact with the fastener and rotation thereof on said one end portion of the elongate element is prevented.
FIGURE 1 is a longitudinal sectional view of a stud which is a first of three embodiments of this invention which have been selected for the purposes of illustrating the invention by way of example;
FIGUR~ 2 is a longitudinal sectional view of a bolt which is the second embodiment of this invention; and FIGURE 3 is a longitudinal sectional view of a bolt which is the third embodiment of the invention.
The stud 10 shown in Figure 1 is hollow, having an opening 11 extending completely through the stud from one , .,:
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~LZ~ 2 end thereof to the other end. On opposite end portions of the stud are formed respective male sicrew threads 12 and 13. The threads and the opening 11 have a common axis 14.
There extends through the opening 11 an elongate element in the form o~ a pin 15, opposite end portions of which protrude from the opening at opposite ends of the stud. On the protruding end portions are 1secured', respective abutments 16 and 17 which lie adjacent to respective end faces 18 and 19 of the stud and are fixed with respect to the ~in.These abutments are kixed ,w,ith r~es,peet---tb''thé- pin~ ,and may be structurally separate elements which are crimped or swaged onto the pin. At least one of the abutments is applied to the pin 15 after the pin has been inserted through the opening 11, thereby trapping the stud 1~ between the abutments on the pin.
The pin 15 is a free sliding fit inside the stud 10.
When the device is unstressed, the separation between the abutments 16 and 17 is slightly greater than the length of the stud so that the abutments and pin can turn freely together about the axis 14 relative to the stud. When the stud is subjected to tensile stress, it is stretched.
When a predetermined part of the length of the stud is subjected to a predetermined tensile stress, the length of the stud is increased to the distance separating the abutments 16 and 17. The end faces of the stud then engage the abutments under sufficient pressure to inhibit rotation of the abutments and pin 15. ~ user can ascertain when the predetermined stress has been achieved by testing one of the abutments for freedom to turn about the axis. When the abutment cannot be turned by hand, the predetermined stress has been achieved.
Certain parts of the bolt shown in Figure correspond to parts of the stud hereinbefore described .
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with reference to Figure 1. Such corresponding parts are indicated by like reference numerals with the prefix 1 and the preceding description is deemed to apply, except for the differences hereinafter mentioned.
The bolt 110 has a screw thread 112 on one end portion and a head 120 at its opposite end.~ In use, the thread 112 is engaged with a female screw thread formed in a further member (not shown) and a part of the bolt lying between that further member and the head 120 is subjected to tensile stress. When the tensile stress reaches a predetermined value, pressure contact is established between abutment 116 and the head 120 and between abutment 117 and an end face 118 of the bolt remote from the head. This pressure contact impedes turning of the abutments and pin 115 about the axis 114.
In the stud shown in Figure 1 and the bolt shown in Figure 2, identical annular abutments are provided at opposite ends of the pin In an alternative arrangement9 there may be provided at one end of the pin an abutment of different form,for example a head on the pin or some other form of abutment integral with the pin or a cotter which extends transversely of the pin through a hole therein. Furthermore, the arrangement may be such that the pin and one abutment are constrained against rotation relative to the fastener, the one abutment anchoring the associated end portion of the pin against axial movement relative to the fastener in a direction towards the other abutment and the other abutment being rotatable relative to the pin whilst the fastener is unstressed. In a case where the abutment is required to be rotatable relative to the pin, when,the fastener is un~tressed, the abutment may be trapped between a head on the pin and an end face of the fastener~
In the embodiment illustrated in Figure 3, a bolt 21n has a screw thread 212 on one end portion and a head 220 on its opposite end. In use, the thread 212 is engaged by a ~emale sorew thread formed in a ~urther ~ ' ' ' ':' :
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member (not shown) and a part of the bolt lying between that further member and the head 220 is subjected to 'tensile stress.
The bolt is provided with a bore 211, which i5 coaxial with the longitudinal axis 214 of the thread 212 of the bolt. Whereas in the embodiments illustrated in Figures 1 and 2, the bores 11 and 111 extend entirely through the faskener, in the embodiment illustrated in Figure 3, the bore 211 extends only part way into the fastener.
The device also comprises an elongate pin 215 in the bore 211, one end portion of the pin which is provided with a head 221, protruding from the bore, the opposite end of the pin being secured within the inner end of the bore 211, as is shown at 215, and which may be effected by any convenient means, such as screwing, adhesive, or pressing, thus preventing movement of that end portion of the pin relative to the bolt 211.
In the embodiment illustrated in Figure 3, an abutment in the form of a washer 217 is mounted on said end portion of the pin 215, held captive against axial movement between the head 220 of the bolt and the head 221 of the pin.
When the fastener is in an unstressed condition, the head 221 of the pin is spaced~from the head 220 of the bolt, and the washer 217 may rotate on the pin 215.
However;, when the fastener is subjected to predetermined tensile stress, relative axial movement takes place between the bolt 2I0 in the region of the head 220 thereof, and said end portion of the pin protruding from the bore 211, and the head 221 of the pin~moves towards the head 220 of the bolt, clamping the washer 21T between the head of the pin and the end face of the fastener, to prevent rotation of the washer.
It will~ be noted ~that~ th~e head 221 of the pin is partly~overlapped wi~th the head 220 of the bolt.
If~desi;red, a covering 226 may be cIipped over~the head 220 of the bolt, to~malntain the head of the pin and ~the~washer~ Pree ~rom~dirt.
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In each of the exarnples described herein, the pin has at least approximately the same co-efficient of thermal expansion as does the fastener. Preferably, the pin and the fastener are formed of the same metal so that they have the same co-efficient of thermal expansion.
During tightening of the fastener, the abutmènt or one of the abutments is preferably accessible so that the user can check the freedom of the abutment to turn either continuously or intermittently. The abutment is also preferably accessible during the subsequent ser~ice life of the fastener so that the freedom of the abutment to turn can be checked occassionally. If the tension in the fastener falls sufficiently for the abutment to become free to turn, remedial measures can be taken before leakage or damage occurs.
.
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This invention relates to a device comprising a fastener formed with a male screw thread and which, in use, is subjected to tension. The invention may be applied to bolts and studs.
The invention concerns the provision in a fastener device of means for enabling a user to determine when the device has been tightened to a predetermined degree. An example of a fastener device having such means is disclosed in U.S. Patent 2,413,797. This known fastener device is a bolt having a bore which extends along the axis of the bolt and is open at each end of the bolt. In an end face of the bolt remote from the head, there is provided a transverse groove. A rod extends along the entire length of the bore and is secured to the bolt adjacent to the head thereof. At the opposite end of the rod, there is provided an elongated head which, when the bolt is unstressed, protrudes from the end of the bolt.
When the bolt is subjected to a predetermined stress, the bolt is stretched and the head of the rod seats in the transverse groove so that it no longer protrudes from the end of the bolt. This indicates visually to the user that the bolt has been tightened a predetermined amount.
The degree of accuracy with which a predetermined stress can be established in the bolt disclosed in the aforesaid U.S. Patent depends upon the quality of the eyesight of the user, qualities of the fastener device~
for example the colour and cleanliness of the head of the rod and o~ the end of the bolt, an adequate level of illumination of the fastener device and upon whether the fastener device can be viewed from an appropriate position so that the line of sight is substantially perpendicular to the length oE the bolt.
According to a fi~rst aspeot of the invention, there is provided a device comprising a fastener formed with a male screw thread and with an opening extending through :
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.
.
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the fastener in a direction parallel to an axi~s of the thread, the device further comprising an elongate element which extends through the opening, characterised in that the elongate element protrudes from opposite ends of the opening, in that there are on the elongate element respective abutments between which the fastener is trapped and in that, when the fastener is unstressed, at least one of the abutments is free to turn about the axis and, when the fastener is subjected to a predetermined tensile stress, the fastener is stretched to engage both abutments under pressure and thereby impede turning of said one of the abutments, relative to the fastener.
When a device in accordance with the invention is in use, the tension in the fastener can be checked by ascertaining whether the abutment is free to turn. If the abutment is free to turn, the tension is below the predetermined value. Clear vision of the fastener is not necessary, in order for the tension to be checked. It is merely necessary that the one abutment can be reached.
At least one, and preferably both, of the abutments is structurally separate from the elongate element and i5 engaged therewith in a manner to prevent mGvement of the abutment relative to the elongate element along the axis.
According to a second aspect of the invention there is provided a device comprising a hollow fastener formed with a male screw thread, a pin which is arranged co-axially with the thread and is disposed partly inside the fastener and partly protruding therefromJ a part of the pin which lies outside the fastener having an abutment which lies~adjacent to an end face of a fastener, and a part of the pin remote from the abutment being anchored against movement relative to the fastener along the axis towards said end face, characterised in that, when the fastener is unstressed, the abutment is free to turn about the axis relatiYe to the fastener andJ when the fastener is subjected to a predetermined tensile stress, the fastener ls stretched to establish a pressure contaot .
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-4between the abutment and said end face and thereby impede turning of the abutment relative to the fastener.
According to khis invention there is also provided a device comprising a fastener formed with a screw thread and having a bore extending therein parallel to the longitudinal axis of the thread, and an elongate element in the bore, the improvement wherein one end portion of the element protrudes from the bore and means is provided, which is operative between the fastener and the opposite end portion of the element, to prevent movement of said opposite end portion of the element relative to the fastener in at least one axial direction, and wherein when the fastener is in an unstressed condition a member on said one end portion of the elongate element is free to rotate about the longitudinal axis, and wherein when the fastener is subjected to a predetermined tensile stress, the member is brought into contact with the fastener and rotation thereof on said one end portion of the elongate element is prevented.
FIGURE 1 is a longitudinal sectional view of a stud which is a first of three embodiments of this invention which have been selected for the purposes of illustrating the invention by way of example;
FIGUR~ 2 is a longitudinal sectional view of a bolt which is the second embodiment of this invention; and FIGURE 3 is a longitudinal sectional view of a bolt which is the third embodiment of the invention.
The stud 10 shown in Figure 1 is hollow, having an opening 11 extending completely through the stud from one , .,:
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~LZ~ 2 end thereof to the other end. On opposite end portions of the stud are formed respective male sicrew threads 12 and 13. The threads and the opening 11 have a common axis 14.
There extends through the opening 11 an elongate element in the form o~ a pin 15, opposite end portions of which protrude from the opening at opposite ends of the stud. On the protruding end portions are 1secured', respective abutments 16 and 17 which lie adjacent to respective end faces 18 and 19 of the stud and are fixed with respect to the ~in.These abutments are kixed ,w,ith r~es,peet---tb''thé- pin~ ,and may be structurally separate elements which are crimped or swaged onto the pin. At least one of the abutments is applied to the pin 15 after the pin has been inserted through the opening 11, thereby trapping the stud 1~ between the abutments on the pin.
The pin 15 is a free sliding fit inside the stud 10.
When the device is unstressed, the separation between the abutments 16 and 17 is slightly greater than the length of the stud so that the abutments and pin can turn freely together about the axis 14 relative to the stud. When the stud is subjected to tensile stress, it is stretched.
When a predetermined part of the length of the stud is subjected to a predetermined tensile stress, the length of the stud is increased to the distance separating the abutments 16 and 17. The end faces of the stud then engage the abutments under sufficient pressure to inhibit rotation of the abutments and pin 15. ~ user can ascertain when the predetermined stress has been achieved by testing one of the abutments for freedom to turn about the axis. When the abutment cannot be turned by hand, the predetermined stress has been achieved.
Certain parts of the bolt shown in Figure correspond to parts of the stud hereinbefore described .
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with reference to Figure 1. Such corresponding parts are indicated by like reference numerals with the prefix 1 and the preceding description is deemed to apply, except for the differences hereinafter mentioned.
The bolt 110 has a screw thread 112 on one end portion and a head 120 at its opposite end.~ In use, the thread 112 is engaged with a female screw thread formed in a further member (not shown) and a part of the bolt lying between that further member and the head 120 is subjected to tensile stress. When the tensile stress reaches a predetermined value, pressure contact is established between abutment 116 and the head 120 and between abutment 117 and an end face 118 of the bolt remote from the head. This pressure contact impedes turning of the abutments and pin 115 about the axis 114.
In the stud shown in Figure 1 and the bolt shown in Figure 2, identical annular abutments are provided at opposite ends of the pin In an alternative arrangement9 there may be provided at one end of the pin an abutment of different form,for example a head on the pin or some other form of abutment integral with the pin or a cotter which extends transversely of the pin through a hole therein. Furthermore, the arrangement may be such that the pin and one abutment are constrained against rotation relative to the fastener, the one abutment anchoring the associated end portion of the pin against axial movement relative to the fastener in a direction towards the other abutment and the other abutment being rotatable relative to the pin whilst the fastener is unstressed. In a case where the abutment is required to be rotatable relative to the pin, when,the fastener is un~tressed, the abutment may be trapped between a head on the pin and an end face of the fastener~
In the embodiment illustrated in Figure 3, a bolt 21n has a screw thread 212 on one end portion and a head 220 on its opposite end. In use, the thread 212 is engaged by a ~emale sorew thread formed in a ~urther ~ ' ' ' ':' :
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member (not shown) and a part of the bolt lying between that further member and the head 220 is subjected to 'tensile stress.
The bolt is provided with a bore 211, which i5 coaxial with the longitudinal axis 214 of the thread 212 of the bolt. Whereas in the embodiments illustrated in Figures 1 and 2, the bores 11 and 111 extend entirely through the faskener, in the embodiment illustrated in Figure 3, the bore 211 extends only part way into the fastener.
The device also comprises an elongate pin 215 in the bore 211, one end portion of the pin which is provided with a head 221, protruding from the bore, the opposite end of the pin being secured within the inner end of the bore 211, as is shown at 215, and which may be effected by any convenient means, such as screwing, adhesive, or pressing, thus preventing movement of that end portion of the pin relative to the bolt 211.
In the embodiment illustrated in Figure 3, an abutment in the form of a washer 217 is mounted on said end portion of the pin 215, held captive against axial movement between the head 220 of the bolt and the head 221 of the pin.
When the fastener is in an unstressed condition, the head 221 of the pin is spaced~from the head 220 of the bolt, and the washer 217 may rotate on the pin 215.
However;, when the fastener is subjected to predetermined tensile stress, relative axial movement takes place between the bolt 2I0 in the region of the head 220 thereof, and said end portion of the pin protruding from the bore 211, and the head 221 of the pin~moves towards the head 220 of the bolt, clamping the washer 21T between the head of the pin and the end face of the fastener, to prevent rotation of the washer.
It will~ be noted ~that~ th~e head 221 of the pin is partly~overlapped wi~th the head 220 of the bolt.
If~desi;red, a covering 226 may be cIipped over~the head 220 of the bolt, to~malntain the head of the pin and ~the~washer~ Pree ~rom~dirt.
, . ~ , . ~
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In each of the exarnples described herein, the pin has at least approximately the same co-efficient of thermal expansion as does the fastener. Preferably, the pin and the fastener are formed of the same metal so that they have the same co-efficient of thermal expansion.
During tightening of the fastener, the abutmènt or one of the abutments is preferably accessible so that the user can check the freedom of the abutment to turn either continuously or intermittently. The abutment is also preferably accessible during the subsequent ser~ice life of the fastener so that the freedom of the abutment to turn can be checked occassionally. If the tension in the fastener falls sufficiently for the abutment to become free to turn, remedial measures can be taken before leakage or damage occurs.
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Claims (18)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device comprising a hollow fastener formed with a male screw thread, a pin which is arranged co-axially with the thread and is disposed partly inside the fastener and partly protruding therefrom, a part of the pin which lies outside the fastener having an abutment which lies adjacent to an end face of the fastener, a part of the pin remote from the abutment being anchored against movement relative to the fastener along said axis towards said end face, the fastener being unstressed and the abutment being free to turn about the axis relative to the fastener, the device having an arrangement such that when the fastener is subjected to a predetermined tensile stress, the fastener is stretched to establish pressure contact between the abutment and said end face and thereby impede turning of the abutment relative to the fastener.
2. A device according to Claim 1 wherein said abutment is formed separately from the pin and is fixedly secured on said part of the pin.
3. A device according to Claim 1 wherein the abutment is trapped between the fastener and a head on the pin.
4. A device according to Claim 3 wherein one end portion of the pin is fixed to the fastener.
5. In a device comprising a fastener formed with a screw thread and having a bore extending therein parallel to the longitudinal axis of the thread, and an elongate element in the bore, the improvement wherein one end portion of the element protrudes from the bore and means is provided, which is operative between the fastener and the opposite end portion of the element, to prevent movement of said opposite end portion of the element relative to the fastener in at least one axial direction, wherein said one end portion of the elongate element includes a head, wherein there is on said one end portion a member which is trapped between the fastener and the head and is free to rotate about the longitudinal axis, and wherein when the fastener is subjected to a predetermined tensile stress, said member is brought into contact with the fastener and rotation thereof on said one end portion of the elongate element is prevented.
6. A hollow fastener formed with a male screw thread and having an end face provided with an opening to the interior of the fastener, an elongate element lying partly in the interior of the fastener and protruding therefrom through said opening and an abutment on the protruding portion of the elongate element, wherein the fastener is in tension, the elongate element is anchored at a position remote from said end face against movement relative to the fastener in a direction towards the end face and the abutment is engaged by said end face with sufficient pressure to restrain rotation of the abutment relative to the fastener.
7. A fastener according to Claim 6 wherein the elongate element has a head which also is engaged with the abutment under pressure so that the abutment is trapped between the head of the elongate element and said end face of the fastener.
8. In a device comprising a fastener formed with a male screw thread having an axis and with an opening extending through the fastener in a direction parallel to the axis of the thread, the device further comprising an elongate element which extends through the opening, the improve-ment wherein said elongate element protrudes from opposite ends of the opening, each end portion of the elongate element has a respective associated abutment, the fastener is trapped between the abutments, the fastener is unstressed, at least one of the abutments is free to turn about the axis relative to the fastener and wherein the fastener has an arrangement such that, when the fastener is subjected to a predetermined tensile stress, the fastener is stretched to engage both abutments under pressure and thereby impede turning of said one of the abutments, relative to the fastener.
9. The improvement according to Claim 8 wherein at least one of the abutments is formed separately from the elongate element and engages said element in a manner to prevent movement of the abutment relative to the elongate element along said axis.
10. The improvement according to Claim 8 or Claim 9 wherein, in the unstressed condition of the fastener, both of the abutments and the elongate element are free to turn about said axis relative to the fastener.
11. The improvement according to Claim 8 wherein at least one of said abutments is annular and the elongate element extends through said one abutment.
12. A device according to Claim 8 wherein said one abutment is rotatable relative to the elongate element.
13. A device comprising a hollow fastener formed with a male screw thread and with an end face, an indicating element adjacent to said end face and connecting means for connecting said indicating element turnably with the fastener, wherein said connecting means holds the indicating element adjacent to said end face, allows, whilst the fastener is unstressed, turning of the indicating element relative to the fastener about an axis which extends along the fastener and establishes pressure contact between the indicating element and said end face when the fastener is stretched by tensile stress of a predetermined magnitude, thereby impeding turning of the indicating element relative to the fastener, wherein the connecting means includes an elongate element disposed partly inside the fastener and partly protruding therefrom, the indicating element is on the part of the elongate element which lies outside the fastener and wherein the connecting means includes anchoring means anchoring the elongate element against movement relative to a part of the fastener remote from the indicating element in a direction towards said end face.
14. A device according to Claim 13 wherein said part of the elongate element which lies outside the fastener includes a head, said indicating element is formed separately from the elongate element and the indicating element is trapped between the fastener and the head of the elongate element.
15. A device according to Claim 13 wherein said anchoring means fixes with respect to the fastener the end portion of the elongate element which is remote from the indicating element and wherein the indicating element is turnable relative to the elongate element about said axis without axial movement relative to the fastener or the elongate element.
16. A device according to Claim 13 wherein the indicating element is rotatably mounted on the elongate element.
17. In combination, a hollow fastener, a pin and a washer wherein the fastener is formed with a male screw thread defining an axis of the fastener, the fastener has an abutment face which faces along the axis, the pin extends along the interior of the fastener, the pin is anchored to the fastener at a position remote from the abutment face of the fastener against movement of the pin relative to the fastener at said position in a direction towards the abutment face, the pin has an abutment face which is spaced further from said position than is the abutment face of the fastener, the abutment face of the pin faces towards the abutment face of the fastener, the washer is mounted on the end portion of the pin and is trapped between the respective abutment faces of the fastener and pin, the washer is rotatable relative to the fastener when the fastener is unstressed and, when the fastener is subjected to a predetermined tension, both of said abutment faces engage the washer under pressure to impede rotation of the washer.
18. A combination as defined in Claim 17 wherein the fastener has been set to a predetermined tension and both of said abutment faces engage the washer under pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000407729A CA1248372A (en) | 1982-07-21 | 1982-07-21 | Fastener device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000407729A CA1248372A (en) | 1982-07-21 | 1982-07-21 | Fastener device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1248372A true CA1248372A (en) | 1989-01-10 |
Family
ID=4123261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407729A Expired CA1248372A (en) | 1982-07-21 | 1982-07-21 | Fastener device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1248372A (en) |
-
1982
- 1982-07-21 CA CA000407729A patent/CA1248372A/en not_active Expired
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